tweak image_to_vm option description

Remove implication of network use.

BUG=None
TEST=None

Change-Id: I3abe18414e8f2517202a06ce052abf38eb4073ef
Reviewed-on: https://chromium-review.googlesource.com/1144214
Commit-Ready: Jacob Kopczynski <jkop@chromium.org>
Tested-by: Jacob Kopczynski <jkop@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/image_to_vm.sh b/image_to_vm.sh
index 34c8419..e053c52 100755
--- a/image_to_vm.sh
+++ b/image_to_vm.sh
@@ -37,7 +37,8 @@
 DEFINE_string state_image "" \
   "Stateful partition image (defaults to creating new statful partition)"
 DEFINE_boolean test_image "${FLAGS_FALSE}" \
-  "Fetches image from ${CHROMEOS_TEST_IMAGE_NAME}."
+  "Acquires image from ${CHROMEOS_TEST_IMAGE_NAME} instead of " \
+  "${CHROMEOS_IMAGE_NAME}."
 DEFINE_string to "" \
   "Destination folder for VM output file(s)"